41C-05-180 (9 April 1984) --- Astronaut Terry J. Hart, 41-C mission specialist, holds a 70 pound IMAX camera in the middeck of the Earth orbiting Space Shuttle Challenger. The motion picture camera (65mm) handles 1,000 ft. rolls which have a running time of three minutes (24 frames per second). Hart, who used a black bag as a sort of in space darkroom for five film change outs throughout the flight, commented to ground controllers that the film magazines were much easier to reload in space than in the normal one G environment on Earth.